2012年8月30日 星期四

認識視網膜裂孔


(1) 性質/病徵
一般來說, 週邊視網膜退化、深近視眼、外傷、玻璃體牽引等多種原因,可造成視網膜裂孔。 視網膜裂孔很多時是没有明顯的病徵,部份患者會感覺出現閃光和眼前黑影的病徵,如果沒有得到適當的治理,嚴重的話,患者會進至視網膜脫落, 以至突然喪失視力。

(2) 與視網膜脫落的關係
對於年青人來說,視網膜退化是引起視網膜裂孔和視網膜脫落的主要原因,如同時出現以下情況的視網膜退化或裂孔,應及早進行光凝治療,否則可在下列情況下,引致視網膜裂孔,甚至視網膜脫落的機會比較大 :


  • 有明顯的玻璃體黏連,眼前有黑影/出現閃光感覺
  • 玻璃體與視網膜退化同時出現
  • 有視網膜脫落家族歷史
  • 另一眼睛曾有視網膜脫落的情況
  • 患有深近視, 且退化範圍較大


(3) 治療方法
在視網膜未有脫落前,採用激光光凝治療的方法。由激光光凝所產生的熱凝固反應,在視網膜退化、裂孔和視網膜脫離的邊緣造成視網膜脉絡膜的瘢痕性黏連,防止視網膜脫落的發生或進一步擴大。


以上所提供的資訊僅作為教育及參考用途,如果你有任何醫療問題,應向自己的眼科醫生查詢,而不應單倚賴以上提供的資料。

2012年8月16日 星期四

糖尿病視網膜病變


糖尿病視網膜,俗稱糖尿病上眼,是因糖尿病影響視網膜內的微絲血管,令到血管膨脹擴大,滲出血液,引起黃斑點水腫,甚至玻璃體出血,視網膜脫落和青光眼等眼疾。它是導致失明最普遍的眼疾之一。


(1) 糖尿病視網膜病變的普及性
患上糖尿病的時間越長,產生視網膜病變的機會就越高,例如患上糖尿病十年或以上,約有一半患者會產生視網膜病變;而患上糖尿病三十年或以上,約九成病人會有這病變。

(2) 糖尿病視網膜病變的病徵
包括視力下降及飛蚊,但早期的病變會出現沒有病徵的情況。

(3) 糖尿病視網膜病變的治療方法
可使用激光手術。當病變發展到某一階段,激光手術可有效地預防病情惡化;但當病情巳到了後期,激光便再無效,而需要複雜的手術治療,包括玻璃體切除手術及視網膜脫落手術。

(4) 糖尿病患者注意事項

  • 留意視力有沒有出現衰退或改變的現像
  • 預防勝於治療
  • 好好控制血糖及其他相關的疾病,如高血壓等
  • 如有需要,必須儘快轉介眼科醫生診治


如巳接受眼科專科的服務,謹記定期到眼科醫生處檢查眼底,並從醫生指示覆診和及早治療


以上所提供的資訊僅作為教育及參考用途,如果你有任何醫療問題,應向自己的眼科醫生查詢,而不應單倚賴以上提供的資料。

2012年8月9日 星期四

Amblyopia Diagnosed and Treated



How Is amblyopia Diagnosed?

All children should be screened before they are school age. Your child's doctor or the vision program at school will check three aspects of your child's eye health:

1. That your child's eyes let light all the way through.
2. That both eyes see equally well.
3. That the eyes are moving normally.

If there's a problem in any of those three areas, the doctor or school nurse may recommend a visit to an eye specialist. If you feel that something could be wrong with your child's vision, call your doctor even if he or she has been screened at school.

Family history of amblyopia is a risk factor for the disorder. Parents cannot tell just by looking at their child if they have amblyopia. Early diagnosis and treatment are the keys to the best visual outcome.

How Is amblyopia Treated?

The most common treatment for amblyopia is to force the brain to start using the "bad" eye. This is done by first correcting any underlying problems in that eye and then by putting a patch over the "good" eye. At first, the child will have a hard time seeing with just the weaker eye. 

However, it is very important that your child wear the patch diligently because this will eventually improve vision. It can take weeks or months for an eye patch to improve vision. It's important to follow your doctor's instructions carefully and that your child is monitored closely during treatment.

It is not intended as medical advice to any specific person. If you have any need for personal advice or have any questions regarding your health, please consult your Ophthalmologist for diagnosis and treatment.